Hedge fund managers like David Einhorn, Bill Ackman, or Carl Icahn became billionaires through reaping large profits for their investors, which is why piggybacking their stock picks may provide us with significant returns as well. Many hedge funds, like Paul Singer’s Elliott Management, are pretty secretive, but we can still get some insights by analyzing their quarterly 13F filings. One of the most fertile grounds for large abnormal returns is hedge funds’ most popular small-cap picks, which are not so widely followed and often trade at a discount to their intrinsic value.